Securing the knives used in paper-pulp-grinding engines



(Model.)

G SMITH Y SECURING 'IHE KNIVES USED IN PAPER PULP GRINDING ENGINES. No. 243.733.

I F L LU r'" Patented July-5, 1881 I N. FETERS. Fhaeo-unm n ner. Wnningx n. D. c.

UNITED STATES PATENT OFFIC GUILFORD SMITH, OF SOUTH WINDHAM, CONNECTICUT.

' SECURING THE KNIVES USED IN PAPER-PULP-GRINDING ENGINES.

SPECIFICATION forming part of Letters Patent No. 243,733, dated July 5, 1881.

Application filed March28, 1881. (Model) I To all whom it may concern Be it known that I, GUILFORD SMrrn, of South Windham, in the county of Windham, and State of Connecticut, have invented a new and useful Improvement in the Securing the Knives Used in Paper-Pulp-Grinding Engines, which improvement is fully set forth in the following specification and accompanying drawings, in which I Figure 1 is a part sectional and partfull view of an engine-cone with the old and my improved mode of securing the knives. Figs. 2 and 3 show an end and side elevation of a knife with my improvement formed upon the same. Fig. 4 is an end View of a knife as applied to the cone of an engine. Fig. 5 is an end view of a knife having my improvement and applied to a cone cut for an old form of knife. Fig. 6 is a part section and part plan view of the cone and knife. Fig. 7 is a side elevation of a knife, showing the means by may be securely attached and detached'from' the cone or shell with the least possible expense and delay. 7 V

In the drawings I represent the ordinary cone or shell for holding the knives by the letter A. The saidcone is securely attached to the shaft B and driven by any suitable means. Upon the exterior of the, cone there are formed a series of ribs, at, having radial slots or recesses a cut in them around their entire circumference. In these slots are formed notches a, as shown in Figs. 8 and 6, which are to prevent the knives from being drawn out radially from the slot, as hereinafter described.

E is a strip of metal of any suitable thickness and depth, and will be designated as a knife. Upon the knife are formed a series of projections,which maybetermed lips or catches, and which may be formed with punches and dies in any well-known manner, such as rolls, di-

rect-actin g punches, 850. These lips are designated by the letter 0, and may all be formed upon one side, as shown in Fig. 1, or on both sides, as may be desired. The knives are also beveled or roundedon the ends, as shown in various views, and are so formed that the pulp may flow freely and not choke up the engine.

To secure the knives from any endwise movement in the slots after they have been placed in position, I form an offset on each knife, as shown at h, Fig. 7, which abuts against the sides of the ribs a and prevents any movement, as shown. The offset has been formed between the two central ribs on the cone; but said offset may be formed between any of the other ribs.

The operation of placing the knives in the cone is as follows: In Fig. 1 the knife E is shown ready to be placed in position in one of the slots cut in the ribs (1, the first movement being in the direction of the arrow marked 1. By the second movement, which is in the direction of the arrow 2, the knife, with its lips e, is caught under the notches a,thus preventin g the knife from being lifted or drawn out radially from the slots when the knives have been placed in positionthat is, when the ends of'the knives are flush with the ends-of the roll. I secure them from any movement endwise by forming an offset between the two middle ribs by forcing a portion of the metal outward on one side, as shown by the dotted section on line :10 a: of Fig. 7. This offset abuts against the ribs and holds the knife from any movement toward either end.

Eeretofore the knives have had a portion of the body made heavier and of wedge shape, and when placedin position in the cone had to be drivensuccessively through each of the ribs formed on the cone, this operation being shown at b, Fig. 1.

I am fully aware that knives have been made IOC out of the knives, while with my improvement there are no rings used, and the time taken to secure or release the knife from its recess is insignificant.

Having thus fully described my invention,

' rounded ends, as and for the purpose set forth.

4. A cone or shell for beating-engines provided with a series of ribs which are recessed radially and laterally, and combined with a knife provided with a series of lips upon its side, as and for the purpose set forth.

5. In a beating-engine, a cone or shell having a series of ribs formed upon it, in combination with a knife having an offset formed upon it, and in contact with and between two or more of the ribs, whereby said knife is prevented from moving toward either end.

GUILFORD SMITH.

Witnesses:

Loans 0. KINNE, (JIIAS. O. ABBE. 

